CN108166398B - Structure and process for preventing bridge hollow slab core mould from floating upwards by utilizing existing exhaust pipe drain pipe - Google Patents
Structure and process for preventing bridge hollow slab core mould from floating upwards by utilizing existing exhaust pipe drain pipe Download PDFInfo
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- CN108166398B CN108166398B CN201810120425.4A CN201810120425A CN108166398B CN 108166398 B CN108166398 B CN 108166398B CN 201810120425 A CN201810120425 A CN 201810120425A CN 108166398 B CN108166398 B CN 108166398B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a structure for preventing a bridge hollow slab core mould from floating up by utilizing the existing vent hole and drain hole facilities, which comprises a bottom template, an outer web template, an inner web template, an exhaust pipe serving as the vent hole template and a drain pipe serving as the drain hole template, wherein a first stiffness member is arranged in the exhaust pipe, two ends of the first stiffness member penetrate out of the outer web template and are connected with a first tensioning and fixing structure, and the middle part of the first stiffness member is in pressure connection with each core mould; the mandrel at the drain pipe is provided with a second stiffness component, and both ends of the second stiffness component downwards pass through the bottom template through the drain pipe and are connected with a second tensioning and fixing structure. The process of the invention comprises the steps of supporting the template, installing the reinforcement cage and the core mold; position correction and fixation, and construction of an anti-floating structure; installing a plug template; and (5) pouring and curing the concrete, and then removing the mould. The invention can prevent the core mould from floating up, does not damage the bridge structure, does not affect the appearance of the bridge, improves the construction quality and the construction efficiency, and reduces the cost of manpower and material resources.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a technology for preventing a mandrel from floating upwards.
Background
With the continuous development of the economic society in China, the investment on infrastructure is increased in various places, and the bridge construction is developed to a great extent. In the construction process of the bridge, the quality and the speed of the prefabrication of the upper structure of the bridge form constraints on the overall construction speed and the construction quality of the bridge. How to accelerate the speed of the prefabrication link on the premise of ensuring the quality becomes a urgent problem to be solved in bridge construction.
Various templates, such as a bottom mold, a side mold, an end mold, a top mold, a core mold, and the like, are required to be used in the prefabrication process of the prefabricated hollow slab for the bridge.
If the steel template is used as a core mould, the defects of inconvenience in manual assembly and disassembly operation, long assembly and disassembly time and the like are caused; and the steel core mould is easy to deform after being used for a certain times, is not easy to repair after deformation, and cannot guarantee the construction precision and the appearance quality.
If the steel pipe is used as the core mold, the use limit is larger, and the steel pipe can only be used in the occasion that the cross section of the cavity of the upper structure of the bridge is round, and the diameter of the cross section of the cavity is 19-26 cm, and the length can not exceed 13 meters. The dead weight of the steel pipe is large, and the steel pipe needs to be assembled into a core mould in a segmented way. If each section is too long, the steel pipe is not easy to draw out after construction. The installation and the extraction of the steel pipe in the construction process are more labor and time-consuming; when the steel pipes are drawn out, the time required by drawing out the steel pipes with different diameters is different, the steel pipes are required to be rotated in the drawing process, the drawing force, the rotation and the drawing speed are controlled, and the poured concrete is damaged if the control is not good.
If the air bag is used as a core mold, the air bag has the advantages of convenient disassembly and assembly and repeated use, but is easy to puncture in use, the adhered slurry is not easy to clean, and the air bag is easy to float in the construction process, so that the problem of insufficient thickness of the local concrete protective layer is caused, and the quality defect is formed.
The floating of the core mold is liable to form a quality defect, and therefore, a structure for preventing the floating of the core mold is required. The anti-floating structure of the core mould in the prior art needs to occupy more space outside the existing structure of the bridge, is inconvenient in construction process and affects the appearance of the bridge. In the existing bridge structure, an exhaust pipe is arranged on a bridge web plate; be equipped with the water drain pipe between mandrel and the bridge bottom plate, current anti-core mould come-up structure, all do not utilize these current structures of bridge to realize better technological effect to the reinforcing bar exposes, influences the outward appearance of bridge.
Disclosure of Invention
The invention aims to provide a structure for preventing a bridge hollow slab core mould from floating upwards by utilizing an existing exhaust pipe drain pipe.
In order to achieve the above purpose, the bridge hollow slab core die floating prevention structure utilizing the existing exhaust pipe and drain pipe comprises a bottom die plate and outer web plate die plates positioned at two sides of the bottom die plate, wherein a cavity surrounded by the bottom die plate and the outer web plate die plates is internally provided with a plurality of inner web plate die plates arranged along the bridge direction, a core die cavity is surrounded between the adjacent inner web plate die plates and the bottom die plate die plates, a plurality of core dies arranged along the bridge direction are arranged in the core die cavity, the core dies are arranged in parallel at intervals, exhaust pipes serving as exhaust hole die plates are arranged at the positions of the inner web plate die plates, and the exhaust pipe penetrates through the inner web plate die plates left and right; the inner web templates positioned at the left end and the right end in the transverse bridge direction are end inner web templates, and the inner web template positioned at the middle in the transverse bridge direction is a middle inner web template; the outer end of the exhaust pipe at the end part inner web template passes through the outer web template, the opening of the outer end of the exhaust pipe is flush with the outer web template, and the inner end of the exhaust pipe at the end part inner web template is adjacent to the adjacent core mould; two ends of the exhaust pipe at the inner web plate template of each middle part are respectively adjacent to the core moulds at two sides of the exhaust pipe;
the exhaust pipes are internally provided with first stiffness members, the first stiffness members penetrate through the exhaust pipes along the transverse bridge direction, two ends of each first stiffness member penetrate through the left and right outer web templates of the exhaust pipes and extend out of the exhaust pipes, and are connected with first tensioning fixing structures, and the middle parts of the first stiffness members bypass the core molds from the tops of the core molds and are in compression joint with the core molds;
a drain pipe serving as a drain hole template is arranged between each core mold and the bottom template, and the drain pipe downwards passes through the bottom template and is flush with the lower surface of the bottom template; the mandrel at the drain pipe is provided with a second stiffness component which is in compression joint with the mandrel from top to bottom, and two ends of the second stiffness component downwards pass through the bottom template through the drain pipe and are connected with a second tensioning fixing structure.
The first tensioning and fixing structure and the second tensioning and fixing structure are any one of the following two structures:
the outer ends of the first stiffness member and the second stiffness member are respectively provided with external threads, the first tensioning fixing structure and the second tensioning fixing structure are tensioning nuts, and the tensioning nuts of the first tensioning fixing structure are in threaded connection with the first stiffness member and are in pressure connection with the external web templates; a tensioning nut of the second tensioning and fixing structure is in threaded connection with the second stiffness member and is in pressure connection with the bottom template;
and the outer ends of the first stiffness component and the second stiffness component are connected with tensioning fixing rods, the length of the tensioning fixing rods at the first stiffness component is larger than the diameter of the exhaust pipe and is pressed on the outer web template, and the length of the tensioning fixing rods at the second stiffness component is larger than the diameter of the drain pipe and is pressed on the bottom template.
A first flat steel for reducing the pressure of the first stiff member to the core mold is arranged between the first stiff member and the core mold, the section of the first flat steel is arc-shaped and is connected with the core mold from top to bottom, and the first stiff member is in compression joint with the core mold through the first flat steel;
and a second flat steel for reducing the pressure of the second stiffness member to the core mold is arranged between the second stiffness member and the core mold, the section of the second flat steel is arc-shaped and is connected with the core mold from top to bottom, and the second stiffness member is in compression joint with the core mold through the second flat steel.
The exhaust pipe, the first stiffness member and the first tensioning and fixing structure are uniformly provided with a plurality of sets along the forward bridge direction, and the interval between each set is 3-5 m.
The invention also discloses a construction process for preventing the bridge hollow slab core mould from floating up by using the existing exhaust pipe and drain pipe, which comprises the following steps in sequence:
the first step is to support a bottom template, an outer web template, a plurality of inner web templates, an exhaust pipe serving as an exhaust hole template and a drain pipe serving as a drain hole template;
the second step is to install a reinforcement cage in a cavity enclosed by the bottom template and the outer web template; a core mold cavity is enclosed between the adjacent inner web templates and the bottom template;
the third step is to adopt cylindrical EPS foam core dies, a plurality of foam core dies are correspondingly penetrated into each core die cavity along the bridge direction one by one, and each foam core die is arranged in parallel and side by side;
the fourth step is to correct and fix the position of the foam core mould;
and fifthly, performing construction of an anti-floating structure, wherein the construction of the anti-floating structure comprises the following two structures:
the construction of the anti-floating structure of the drain pipe; covering a second flat steel on a core mold above the water drain hole, pressing a second stiffness member on the second flat steel from top to bottom, and enabling two ends of the second stiffness member to pass through the water drain pipe downwards and be connected with a second tensioning and fixing structure;
when the second tensioning and fixing structure adopts a tensioning bolt, the tensioning bolt is connected with the end part of the second stiffness member in a threaded manner, and the tensioning bolt is screwed tightly so as to be in press connection with the bottom template;
when the second tensioning and fixing structure adopts a tensioning and fixing rod, connecting the end part of the second stiffness member with the tensioning and fixing rod, rotating the tensioning and fixing rod to tension the second stiffness member, and pressing the core die by the second stiffness member through the second flat steel and pressing the second tensioning and fixing structure on the bottom die plate;
construction of an anti-floating structure of the exhaust pipe: covering the first flat steel on each core mold at the exhaust pipe, enabling the first stiffness member to penetrate through the exhaust pipe at each web plate, enabling the first stiffness member to bypass each first flat steel from top to bottom, enabling the first flat steel to be in compression joint with the core mold, enabling two ends of the first stiffness member to extend out of the outer web plate template respectively, and connecting the first tensioning and fixing structure;
when the first tensioning and fixing structure adopts a tensioning bolt, the tensioning bolt is connected to the end part of the first stiffening member in a threaded manner, and the tensioning bolt is screwed tightly so as to be in press connection with the outer web template;
when the first tensioning and fixing structure adopts a tensioning and fixing rod, connecting the end part of the first stiffness member with the tensioning and fixing rod, and rotating the tensioning and fixing rod to tension the first stiffness member, wherein the first stiffness member is used for pressing the first tensioning and fixing structure on the outer web template;
the sixth step is to install plug templates at two ends of a cavity enclosed by the bottom template and the outer web template along the forward bridge direction;
and seventh, after pouring and curing the concrete, removing the mould, and keeping the foam core mould inside the precast hollow slab.
The spacing between the vertical steel bars in the forward direction of the bridge is 25 cm.
The invention has the following advantages:
in the past in the work progress, because concrete material has buoyancy to the mandrel when pouring concrete, consequently the mandrel floats easily to leave the design position, reduce construction quality. The invention adopts the anti-floating structure, and the first stiffness component and the second stiffness component can prevent the core mould from floating upwards when the core mould has a floating trend, so that the position of the core mould is reliably fixed in the construction process, and the construction quality is improved compared with the prior art.
The first stiffness member passes through each exhaust pipe, and can effectively prevent the core mold from floating up when the overall floating trend occurs by utilizing the tensioning force of the tensioning and fixing structure and each exhaust pipe. The first stiffness component is provided with a plurality of sets along the forward bridge direction, so that resistance can be uniformly applied to the core mold in the length direction of the core mold, and a better anti-floating effect is achieved. The second stiffness members are arranged up and down and are directly fixed at the bottom template by the second tensioning and fixing structure, so that the anti-floating force is greatly enhanced.
The arrangement of the first flat steel and the second flat steel can greatly reduce the pressure of the stiff member to the core mold and prevent the stiff member from being pressed in to damage the core mold.
The existing pore canal (the vent hole template and the drain hole template, namely the drain pipe and the drain pipe) of the bridge is utilized by the first stiffness member and the second stiffness member, so that the construction is convenient, the bridge structure is not damaged, the steel bars are prevented from being exposed, the appearance of the bare concrete is neat, and the appearance of the bridge is not influenced.
The prior steel core die has the defects of heavy weight and high cost of the core die. If the core mould is not taken out after construction, the weight of the bridge precast hollow slab is greatly increased on one hand, and the cost is greatly increased on the other hand. Therefore, when the steel core mold is used for construction, the core mold needs to be drawn out after the construction is completed (the bridge precast hollow slab is manufactured). When the mandrel is pulled out, more manpower and material resources are required, more working hours are required, and the cast concrete is damaged due to poor pulling-out operation control.
The foam core mould is adopted, the material is light, the bridge is not drawn out after construction, and the influence on the dead weight of the bridge is very little; meanwhile, the cost of the EPS foam material is lower than the cost of manpower and material resources for extracting the core mold, so after the structure and the process are adopted, the core mold is not required to be extracted after construction is finished, the cost is not increased, the bridge dead weight is not greatly increased, the consumption of manpower and material resources is reduced, the labor hour for extracting the core mold is saved, and the construction efficiency is greatly improved. By adopting the structure and the process, the risk of the air bag being punctured is not required, and the defect of floating of the air bag is avoided.
Drawings
FIG. 1 is a schematic view of the structure of the present invention at an exhaust pipe;
FIG. 2 is a schematic top view of the floating structure of the bridge hollow slab core mold according to the present invention;
fig. 3 is a schematic view of the structure of the present invention at the drain pipe.
The drawings are only used for showing the floating-up prevention structure principle, and are not drawings for practical construction.
Description of the embodiments
In the invention, the bridge length direction is taken as the forward bridge direction, and the bridge width direction is taken as the transverse bridge direction.
As shown in fig. 1, 2 and 3, the floating structure of the bridge hollow slab core mould 5 for preventing the bridge hollow slab by utilizing the existing exhaust pipe and drain pipe comprises a bottom formwork 1 and outer web formworks 2 positioned at two sides of the bottom formwork, a plurality of inner web formworks 3 arranged along the bridge direction are arranged in a cavity surrounded by the bottom formwork 1 and the outer web formworks 2, a core mould cavity 4 is surrounded between the adjacent inner web formworks 3 and the bottom formwork 1, a plurality of core moulds 5 arranged along the bridge direction are arranged in the core mould cavity 4, and the core moulds 5 are arranged in parallel at intervals;
an exhaust pipe 6 serving as an exhaust hole template is arranged at each inner web template 3, and the exhaust pipe 6 penetrates through the inner web templates 3 left and right; the inner web templates 3 positioned at the left end and the right end in the transverse bridge direction are end inner web templates, the inner web templates 3 positioned at the middle in the transverse bridge direction are middle inner web templates, and the middle inner web templates are positioned between the two end inner web templates; the outer end of the exhaust pipe 6 at the end part inner web template passes through the outer web template 2, the opening of the outer end of the exhaust pipe is flush with the outer web template 2, and the inner end of the exhaust pipe 6 at the end part inner web template is adjacent to the adjacent core mold 5; two ends of the exhaust pipe 6 at the inner web template of each middle part are respectively adjacent to the core mold 5 at two sides of the exhaust pipe;
a first stiffening member 7 is arranged in each exhaust pipe 6, the first stiffening member 7 penetrates each exhaust pipe 6 along the transverse bridge direction, two ends of the first stiffening member 7 penetrate through the exhaust pipe 6, extend out of the left outer web template 2 and the right outer web template 2, are connected with a first tensioning fixing structure 8, and the middle part of the first stiffening member 7 bypasses each core mold 5 from the top of the core mold 5 and is in pressure connection with each core mold 5; the first stiffening member 7 is a single piece extending transversely across the outer web forms 2 and the inner web forms 3 and is crimped with the mandrels 5 from top to bottom.
The first stiffening member 7 serves to prevent the core form 5 from floating up.
A drain pipe 9 serving as a drain hole template is respectively arranged between each core mould 5 and the bottom template 1, and the drain pipe 9 downwards passes through the bottom template 1 and is flush with the lower surface of the bottom template 1; the mandrel 5 at the water drain pipe 9 is provided with a second stiffness member 10, the second stiffness member 10 is in compression joint with the mandrel 5 from top to bottom, and two ends of the second stiffness member 10 pass through the bottom template 1 downwards through the water drain pipe 9 and are connected with a second tensioning and fixing structure 11; the second stiffening member 10 serves to prevent the core form 5 from floating up.
Wherein, first stiffness member 7 and second stiffness member 10 are all made of steel bar, and are low in cost and convenient for construction.
The first tensioning fixing structure 8 and the second tensioning fixing structure 11 are identical in structure and are any one of the following two structures:
the outer ends of the first stiffness member 7 and the second stiffness member 10 are respectively provided with external threads, the first tensioning and fixing structure 8 and the second tensioning and fixing structure 11 are tensioning nuts, and the tensioning nuts of the first tensioning and fixing structure 8 are in threaded connection with the first stiffness member 7 and are in compression joint with the external web template 2; the tensioning nut of the second tensioning and fixing structure 11 is in threaded connection with the second stiffening member 10 and crimped onto the bottom die plate 1;
the outer ends of the first stiffness member 7 and the second stiffness member 10 are connected with tensioning fixing rods, the length of the tensioning fixing rods at the first stiffness member 7 is larger than the diameter of the exhaust pipe 6 and is pressed on the outer web template 2, and the length of the tensioning fixing rods at the second stiffness member 10 is larger than the diameter of the drain pipe 9 and is pressed on the bottom template 1.
A first flat steel 12 for reducing the pressure of the first stiffening member 7 on the core mold 5 is arranged between the first stiffening member 7 and the core mold 5, the section of the first flat steel 12 is arc-shaped and is connected with the core mold 5 from top to bottom, and the first stiffening member 7 is in compression joint with the core mold 5 through the first flat steel 12;
a second flat steel 13 for reducing the pressure of the second stiffness member 10 to the core mold 5 is arranged between the second stiffness member 10 and the core mold 5, the section of the second flat steel 13 is arc-shaped and is connected with the core mold 5 from top to bottom, and the second stiffness member 10 is in compression joint with the core mold 5 through the second flat steel 13;
the exhaust pipe 6, the first stiffness member 7 and the first tensioning and fixing structure 8 are uniformly provided with a plurality of sets along the forward bridge direction, and the interval between each set is 3-5 meters.
The invention also discloses a process for preventing the bridge hollow slab core mould 5 from floating upwards by utilizing the existing exhaust pipe 6 and drain pipe 9, which is carried out by adopting the structure and sequentially carrying out the following steps:
the first step is to support a bottom template 1, an outer web template 2, a plurality of inner web templates 3, an exhaust pipe 6 serving as an exhaust hole template and a drain pipe 9 serving as a drain hole template;
the second step is to install a reinforcement cage in a cavity enclosed by the bottom template 1 and the outer web template 2; a core mould cavity 4 is enclosed between the adjacent inner web templates 3 and the bottom template 1;
the third step is to adopt cylindrical EPS foam core dies 5, a plurality of foam core dies 5 are correspondingly penetrated into each core die cavity 4 along the bridge direction one by one, and each foam core die 5 is arranged in parallel and side by side;
the fourth step is to correct and fix the position of the foam core mold 5;
the fifth step is to construct an anti-floating structure, comprising the following two structures (without sequence):
construction of an anti-floating structure of the drain pipe 9; covering a second flat steel 13 on the core mold 5 above the drain hole, pressing the second stiffness member 10 on the second flat steel 13 from top to bottom, and enabling two ends of the second stiffness member 10 to pass through the drain pipe 9 downwards and be connected with a second tensioning fixing structure 11;
when the second tensioning and fixing structure 11 adopts a tensioning bolt, the tensioning bolt is connected to the end part of the second stiffening member 10 in a threaded manner, and the tensioning bolt is screwed tightly so as to be pressed on the bottom template 1;
when the second tensioning and fixing structure 11 adopts a tensioning and fixing rod, connecting the end part of the second stiffness member 10 with the tensioning and fixing rod, rotating the tensioning and fixing rod to tension the second stiffness member 10, and pressing the second stiffness member 10 against the core mold 5 through the second flat steel 13 and pressing the second tensioning and fixing structure 11 against the bottom mold plate 1;
(II) construction of an anti-floating structure of the exhaust pipe 6: covering the first flat steel 12 on each core mold 5 at the exhaust pipe 6, then enabling the first stiffness member 7 to penetrate through the exhaust pipe 6 at each web, enabling the first stiffness member 7 to bypass each first flat steel 12 from top to bottom, enabling the first stiffness member 7 to be in pressure connection with the core mold 5 through the first flat steel 12, enabling two ends of the first stiffness member 7 to extend out of the outer web template 2 respectively and be connected with the first tensioning and fixing structure 8;
when the first tensioning and fixing structure 8 adopts a tensioning bolt, the tensioning bolt is connected to the end part of the first stiffening member 7 in a threaded manner, and the tensioning bolt is screwed tightly so as to be pressed on the outer web template 2;
when the first tensioning and fixing structure 8 adopts a tensioning and fixing rod, connecting the end part of the first stiffness member 7 with the tensioning and fixing rod, rotating the tensioning and fixing rod to tension the first stiffness member 7, and pressing the first tensioning and fixing structure 8 on the outer web template 2 by the first stiffness member 7;
step six, installing plug templates at two ends of a cavity formed by the bottom template 1 and the outer web template 2 along the forward bridge direction;
the seventh step is to disassemble the mould after pouring and curing the concrete, and keep the foam core mould 5 inside the precast hollow slab;
the spacing between the vertical steel bars in the forward direction of the bridge is 25 cm.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (2)
1. The bridge hollow slab core die floating structure is prevented by utilizing the existing exhaust pipe and drain pipe, and comprises a bottom die plate and outer web plates positioned at two sides of the bottom die plate, wherein a plurality of inner web plates arranged along the bridge direction are arranged in a cavity surrounded by the bottom die plate and the outer web plates, a core die cavity is surrounded between the adjacent inner web plates and the bottom die plate, a plurality of core dies arranged along the bridge direction are arranged in the core die cavity, and the core dies are made of foam materials; the core dies are arranged in parallel at intervals, exhaust pipes serving as exhaust hole templates are arranged at the positions of the inner web templates, and the exhaust pipes penetrate through the inner web templates left and right; the inner web templates positioned at the left end and the right end in the transverse bridge direction are end inner web templates, and the inner web template positioned at the middle in the transverse bridge direction is a middle inner web template; the outer end of the exhaust pipe at the end part inner web template passes through the outer web template, the opening of the outer end of the exhaust pipe is flush with the outer web template, and the inner end of the exhaust pipe at the end part inner web template is adjacent to the adjacent core mould; two ends of the exhaust pipe at the inner web plate template of each middle part are respectively adjacent to the core moulds at two sides of the exhaust pipe;
the method is characterized in that:
the exhaust pipes are internally provided with first stiffness members, the first stiffness members penetrate through the exhaust pipes along the transverse bridge direction, two ends of each first stiffness member penetrate through the left and right outer web templates of the exhaust pipes and extend out of the exhaust pipes, and are connected with first tensioning fixing structures, and the middle parts of the first stiffness members bypass the core molds from the tops of the core molds and are in compression joint with the core molds;
a drain pipe serving as a drain hole template is arranged between each core mold and the bottom template, and the drain pipe downwards passes through the bottom template and is flush with the lower surface of the bottom template; the mandrel at the water drain pipe is provided with a second stiffness member which is in compression joint with the mandrel from top to bottom, and two ends of the second stiffness member downwards pass through the bottom template through the water drain pipe and are connected with a second tensioning and fixing structure;
the first tensioning and fixing structure and the second tensioning and fixing structure are any one of the following two structures:
the outer ends of the first stiffness member and the second stiffness member are respectively provided with external threads, the first tensioning fixing structure and the second tensioning fixing structure are tensioning nuts, and the tensioning nuts of the first tensioning fixing structure are in threaded connection with the first stiffness member and are in pressure connection with the external web templates; a tensioning nut of the second tensioning and fixing structure is in threaded connection with the second stiffness member and is in pressure connection with the bottom template;
the outer ends of the first stiffness component and the second stiffness component are connected with tensioning fixing rods, the length of the tensioning fixing rods at the first stiffness component is larger than the diameter of the exhaust pipe and is pressed on the outer web template, and the length of the tensioning fixing rods at the second stiffness component is larger than the diameter of the drain pipe and is pressed on the bottom template;
a first flat steel for reducing the pressure of the first stiff member to the core mold is arranged between the first stiff member and the core mold, the section of the first flat steel is arc-shaped and is connected with the core mold from top to bottom, and the first stiff member is in compression joint with the core mold through the first flat steel;
a second flat steel for reducing the pressure of the second stiffness member to the core mold is arranged between the second stiffness member and the core mold, the section of the second flat steel is arc-shaped and is connected with the core mold from top to bottom, and the second stiffness member is in compression joint with the core mold through the second flat steel;
the exhaust pipe, the first stiffness member and the first tensioning and fixing structure are uniformly provided with a plurality of sets along the forward bridge direction, and the interval between each set is 3-5 m.
2. The construction process for preventing the bridge hollow slab core mold from floating by using the existing exhaust pipe and drain pipe as claimed in claim 1, sequentially comprises the following steps:
the first step is to support a bottom template, an outer web template, a plurality of inner web templates, an exhaust pipe serving as an exhaust hole template and a drain pipe serving as a drain hole template;
the second step is to install a reinforcement cage in a cavity enclosed by the bottom template and the outer web template; a core mold cavity is enclosed between the adjacent inner web templates and the bottom template;
the third step is to adopt cylindrical EPS foam core dies, a plurality of foam core dies are correspondingly penetrated into each core die cavity along the bridge direction one by one, and each foam core die is arranged in parallel and side by side;
the fourth step is to correct and fix the position of the foam core mould;
and fifthly, performing construction of an anti-floating structure, wherein the construction of the anti-floating structure comprises the following two structures:
the construction of the anti-floating structure of the drain pipe; covering a second flat steel on a core mold above the water drain hole, pressing a second stiffness member on the second flat steel from top to bottom, and enabling two ends of the second stiffness member to pass through the water drain pipe downwards and be connected with a second tensioning and fixing structure;
when the second tensioning and fixing structure adopts a tensioning bolt, the tensioning bolt is connected with the end part of the second stiffness member in a threaded manner, and the tensioning bolt is screwed tightly so as to be in press connection with the bottom template;
when the second tensioning and fixing structure adopts a tensioning and fixing rod, connecting the end part of the second stiffness member with the tensioning and fixing rod, rotating the tensioning and fixing rod to tension the second stiffness member, and pressing the core die by the second stiffness member through the second flat steel and pressing the second tensioning and fixing structure on the bottom die plate;
construction of an anti-floating structure of the exhaust pipe: covering the first flat steel on each core mold at the exhaust pipe, enabling the first stiffness member to penetrate through the exhaust pipe at each web plate, enabling the first stiffness member to bypass each first flat steel from top to bottom, enabling the first flat steel to be in compression joint with the core mold, enabling two ends of the first stiffness member to extend out of the outer web plate template respectively, and connecting the first tensioning and fixing structure;
when the first tensioning and fixing structure adopts a tensioning bolt, the tensioning bolt is connected to the end part of the first stiffening member in a threaded manner, and the tensioning bolt is screwed tightly so as to be in press connection with the outer web template;
when the first tensioning and fixing structure adopts a tensioning and fixing rod, connecting the end part of the first stiffness member with the tensioning and fixing rod, and rotating the tensioning and fixing rod to tension the first stiffness member, wherein the first stiffness member is used for pressing the first tensioning and fixing structure on the outer web template;
the sixth step is to install plug templates at two ends of a cavity enclosed by the bottom template and the outer web template along the forward bridge direction;
and seventh, after pouring and curing the concrete, removing the mould, and keeping the foam core mould inside the precast hollow slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810120425.4A CN108166398B (en) | 2018-02-07 | 2018-02-07 | Structure and process for preventing bridge hollow slab core mould from floating upwards by utilizing existing exhaust pipe drain pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810120425.4A CN108166398B (en) | 2018-02-07 | 2018-02-07 | Structure and process for preventing bridge hollow slab core mould from floating upwards by utilizing existing exhaust pipe drain pipe |
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| CN108166398A CN108166398A (en) | 2018-06-15 |
| CN108166398B true CN108166398B (en) | 2023-10-20 |
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| CN112223497B (en) * | 2020-10-20 | 2022-02-01 | 西南科技大学城市学院 | Mould for hollow core slab |
| CN113464722A (en) * | 2021-06-24 | 2021-10-01 | 北京碧鑫水务有限公司 | Concrete encapsulation method for large-diameter pipeline |
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